These functions copy the (null-terminated) array of com-
plex characters wchstr into the window image structure
starting at the current cursor position. The four func-
tions with n as the last argument copy at most n elements,
but no more than will fit on the line. If n=-1 then the
whole array is copied, to the maximum number of characters
that will fit on the line.
The window cursor is not advanced. These functions work
faster than waddnstr. On the other hand:
o they do not perform checking (such as for the newline,
backspace, or carriage return characters),
o they do not advance the current cursor position,
o they do not expand other control characters to ^-es-
capes, and
o they truncate the string if it crosses the right mar-
gin, rather than wrapping it around to the new line.
These functions end successfully on encountering a null
cchar_t, or when they have filled the current line. If a
complex character cannot completely fit at the end of the
current line, the remaining columns are filled with the
background character and rendition.

All functions return the integer ERR upon failure and OK
on success.
X/Open does not define any error conditions. This imple-
mentation returns an error if the window pointer is null.
Functions with a "mv" prefix first perform a cursor move-
ment using wmove, and return an error if the position is
outside the window, or if the window pointer is null.